Lawn Sprinklers/RPZ Backflow Preventer Permit
The City of Naperville, in compliance with State of Illinois law, requires that an RPZ permit is obtained whenever an irrigation system is installed. This requirement stresses the important function of the RPZ valve (also called a backflow preventer) in the operation of a lawn irrigation system. The RPZ valve is a check valve that prevents impurities, such as insecticides or animal wastes, from invading a home’s potable water system. This valve is crucial to maintaining the purity of a home’s drinking water, and both the State of Illinois and the City of Naperville requires that homeowners accept responsibility of having their RPZ valves be inspected annually.
I have read the above and am ready to complete a Lawn Sprinkler/RPZ Backflow Preventer permit application (PDF).